Fire-alarm



J. J. ORVIS. FIRE ALARM.

(No Model.)

No. 523,003. Patented July 17, 1894.

Celluloid 0 572701 0706/4, ly h'is u l llrgc ys.

S C 5 V D UNITED STATES PATENT OFF CE.

JOHN J, ORVIS, OF ELMIRA,NEW YORK, ASSIGNOR OF ONEHALF TO CHARLES E. POST, OF SAN FRANCISCO, CALIFORNIA.

FIRE-ALARM.

, SPECIFICATION forming part of Letters Patent No. 523,003, dated July 17, 1894.

i Application filed February 24,1894. Serial No. 501409. (No model.)

.1 To aZZ whom it may concern.-

Be it known that I, JOHN J. ORVIs,acitizen ofthe United States, residing at Elmira, in the county of Chemung and State of New York,

i of the invention is to providea cheap,

have invented a new and useful Fire-Alarm, of which the following is a specification. This invention relates to fire'alarms; and it has for its object to effect certain improve ments in those fire alarms which provide for a loud report or explosion upon being subjectcd to the action-of fire, and thereby give an alarm.

To this end the main and primary object simple and efficient device of this class, which will be impervious to water, and at the same time susceptible to quick and rapid action on ac count of the great inflammability of the igniting part thereof.

With these and other objects in view which will readily appear as the nature of the in vention is betterunderstood, the same consists in the novel construction, combination and arrangement of parts hereinafter more fully described, illustrated and claimed.

In the accompanying drawingsz-Figure 1 represents a perspective view of the improved fire-alarm. Fig. 2 is a longitudinal section thereof; Fig. 3 an enlarged detail view of the hollow igniter plug or stem; Fig. 4 an enlarged section of the same.

Referring to the accompanying drawings, a, designates a circular or other suitable shaped explosive case or receptacle adapted to be filled with powder or other suitable explosive, and said case or receptacle is provided at one side and the top thereof with the perforated supporting lug or flange g, which provides means for conveniently hanging the alarm at any desirable location where fire will most likely come in contact therewith very soon after breaking out.

The explosive case or receptacle a, is provided in the lower end thereof with a small feed opening I), which is surrounded by a depending interiorly threaded neck or flange c, and said feed opening b, is adapted to provide means for filling the case or receptacle with the powder or other explosive, but is designed to be as small as consistent with the capability of loading the case, in order that stem d, is closed at its outer end and is adapted to removably receive the threaded end a, of the hollow igniter plug or stem d. The inner exteriorly threaded end of the hollow igniter plug or stem (1, not only engages the threads of the neck 0, but is adapted to bear against the shoulder formed by that part of the case a, immediately surrounding the opening b, thereby providing a perfectly Water tight connection between the plug and the case. The hollow igniter plug or stem (1, preferably consists of an elongated cylindrical body made of celluloid which is a material of sufiicient solidity to be entirely impervious to water and unaffected thereby, while atvthe same time being exceedingly inflammable so that the same will burn on the slightest contact of fire therewith.

The elongated cylindrical iguiter plug or is provided with a longitudinal bore or pocket f, extending longitudinally in the plug or stem from the inner end thereof to a point near the outer closed end, and thislongitudinal pocket or bore is adapted to be aligned in communication with the opening I), so that after filling the'case or receptacle, a, and hanging the same in position, the powder or other explosive will run into and fill up the bore or pocket of said plug or stem.

In use, the alarm is hung up at aconveuient point in the manner described, and the mo ment fire reaches the celluloid plug or stem the latter will immediately catch on fire and burn up very rapidly, thereby igniting the powder or explosive in the pocket or bore f, which will instantly ignite the body of the explosive in the case or receptacle a, and cause an explosion to takeplace, and thereby give a loud report or alarm.

It will be understood that in filling and priming the alarm it is simply necessary to separate the two parts thereof and fill up the case or receptacle a, with the powder or other explosive. The hollow plug or stem g, is then fitted in position and the alarm hung up at ICQ the point desired, when the same will be immediately ready for use, the celluloid plug or stem serving two very important functions, that is, to keep the alarm intact and entirely impervious to water or moisture, while at the same time providinga highly inflammable igniter for the alarm.

While a specific screw-thread connection between the case or receptacle and the igniter plug or stem has been described, it will of course be understood that any other suitable detachable connection may be used, and the case or receptacle may be made of any suitable material and preferably of a 7 material that will be strong and will not break up into pieces and fly about when the explosion 00- ours. It will therefore be understood that changes in the form, proportion and the ininor details of construction. may be resorted to without departing from the principle or sacrificing any of the advantages of this invention. v

Having thus described the invention, what] is claimed, and desired to be secured by Letters Patent, is-

1. In a fire alarm, thecombination of an explosive case or receptacle adapted to contain a suitable explosive and provided with a -bottom opening, and a hollow celluloid igniter plug or stem separablyconnected to said case or receptacle, and open at one end to communicate with the interior of the latter through its bottom opening, to receive a portion of the explosive, contained within said case or receptacle substantially as set forth.

2. In a fire alarm, the combination of an ex plosive caseor receptacle adapted to contain a suitable explosive and provided with a bottom opening and a depending neck surround ing said opening, and an elongated celluloid plug or stem detachably fitted at one end within the neck of said case or receptacle and 

